{"id":24148,"date":"2023-03-27T14:50:15","date_gmt":"2023-03-27T18:50:15","guid":{"rendered":"https:\/\/world.dan.org\/?post_type=dan_alert_diver&p=24148"},"modified":"2023-05-31T12:46:09","modified_gmt":"2023-05-31T16:46:09","slug":"spawning-seas-forever","status":"publish","type":"dan_alert_diver","link":"https:\/\/world.dan.org\/fr\/alert-diver\/article\/spawning-seas-forever\/","title":{"rendered":"Des mers fray\u00e9es pour toujours"},"content":{"rendered":"

<\/a><\/p>\n\n\n\n

To the delight of the divers staying at Tawali Resort on the shores of Milne Bay in Papua New Guinea, Anna\u2019s hunch turns out to be right on track. Her premonition began with a late afternoon sighting of a sea star on its tiptoes exuding a long, lazy spiral of smokey spawn \u2014 a possible tip-off of coral spawning to come. <\/p>\n\n\n\n

Peu apr\u00e8s s'\u00eatre s\u00e9ch\u00e9e, Anna a tap\u00e9 quelques touches rapides et a trouv\u00e9 ce qu'elle esp\u00e9rait : Le frai annuel synchronis\u00e9 des coraux sur la Grande Barri\u00e8re de Corail, non loin au sud de nous, se produirait le quatri\u00e8me soir apr\u00e8s la pleine lune. Le moment est bien choisi. Quatre nuits plus tard, 20 d'entre nous ont effectu\u00e9 une plong\u00e9e que nous n'oublierons jamais. <\/p>\n\n\n\n

Entre 19 heures et 20 heures 30, de nombreuses esp\u00e8ces du genre ubiquiste Acropora<\/em> \u2014 popularly known as staghorn, elkhorn, and plate-forming corals \u2014 launch their entire yearly reproductive payload. It is a single, eye-popping, synchronized mass spawning event cued by the moon phase, water temperature, and disparate factors conducive to a given region.      <\/p>\n\n\n\n

En un instant, la mer se remplit de centaines, puis de milliers, puis de millions de paquets de la taille d'une bille. Ils sont ros\u00e9s et dodus, avec des \u0153ufs et du sperme, et montent inexorablement vers la surface pour repeupler les r\u00e9cifs coralliens proches et lointains. Bient\u00f4t, les multitudes s'unissent au-dessus, formant une nappe brillante qui s'\u00e9tend aussi loin que la lumi\u00e8re de ma main peut atteindre. <\/p>\n\n\n\n

On the ride back to the resort, our skiff of jubilant divers skims past slick after slick blanketing the bay\u2019s wine-dark waters. The heroic sendoff of a new generation of corals into an environmentally uncertain world sends my mind wandering along with the specks of life. <\/p>\n\n\n\n

As the rafts drift offshore, the bundles spill their gametes into a stewing brew of external fertilization. It\u2019s all part of the sea\u2019s grand strategy of synchronized broadcast spawning. This epic game plan provides stationary animals, such as reef-building stony corals and sponges, with high fertilization rates and an energy-efficient means of enhancing genetic diversity. <\/p>\n\n\n\n

At the same time, the sheer flood of fat-filled food, which also includes the gametes of many mobile reef dwellers, overwhelms predators. While the top of the food chain is busy feasting, the lucky would-be prey can escape into the open sea, where fertilized embryos metamorphose into mobile larvae of many types. The corals\u2019 version, known as planula larvae, are tiny, flattened, cilia-powered ovals packed with an inherent sense of destiny.<\/p>\n\n\n\n

\n
\n
\"nappe
A coral slick viewed from below\u00a0\n\u00a9NED AND ANNA DELOACH<\/figcaption><\/figure>\n\n\n\n

<\/p>\n\n\n\n

\"le
The annual coral spawn in Milne Bay, Papua New Guinea \n\u00a9NED AND ANNA DELOACH<\/figcaption><\/figure>\n<\/div>\n\n\n\n
\n
\"fourr\u00e9
Bonaire\u2019s maiden staghorn thicket on its 10th anniversary \n\u00a9NED AND ANNA DELOACH<\/figcaption><\/figure>\n\n\n\n
\"corail
A star coral releasing a BB-sized gamete bundle packed with eggs and sperm\n\u00a9NED AND ANNA DELOACH<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Many mysteries still surround the larvae\u2019s eventual settlement onto stable, nearshore structures. The few survivors that make it back to the reef likely follow chemical clues exuded by members of their species, microbial microfilm, and crustose coralline algae \u2014 the calcifying glue of the reef. <\/p>\n\n\n\n

Une fois install\u00e9s, les vagabonds n'errent plus. En quelques jours, ils se transforment en polypes s\u00e9dentaires, semblables \u00e0 des sacs, avec des tentacules alimentaires entourant leur bouche. Les polypes commencent bient\u00f4t \u00e0 d\u00e9poser des squelettes de carbonate de calcium en forme de coupelles, appel\u00e9s corallites, pour prot\u00e9ger leur corps vuln\u00e9rable. Avec un peu de chance, les polypes bourgeonnent de mani\u00e8re asexu\u00e9e des r\u00e9pliques d'eux-m\u00eames qui en engendrent d'autres jusqu'\u00e0 ce que la colonie grandissante atteigne une maturit\u00e9 suffisante pour ajouter ses gam\u00e8tes lors de la ponte annuelle. Mais tout n'est pas rose pour les nouveaux colons coralliens.<\/p>\n\n\n\n

After a two-year pandemic hiatus, Anna and I arrive in Bonaire to witness the fall\u2019s annual coral spawn. It had been more than 50 years since I first dived at this southern Caribbean island. In those days, massive staghorn and elkhorn thickets paralleled the calm western shoreline for miles. Today the famed offshore slope of boulder, brain, and finger corals still plunges regally from the shallows to 100 feet (30 meters), but the historic inshore thickets are no more. A wide, barren shelf scattered with broken coral rubble jutting from the sand like old bones spreads in their place. The culprits: warming water, bleaching, pollution and associated diseases, elevated storm surge, overfishing, coastal construction \u2014 I\u2019ll stop there. <\/p>\n\n\n\n

Certains parlent de la perte d\u00e9vastatrice, dans toute la r\u00e9gion, d'un habitat naturel complexe cr\u00e9\u00e9 par des enchev\u00eatrements titanesques d'arbres et d'arbustes. Acropora<\/em> branches the \u201cflattening of the Caribbean.\u201d These labyrinths of untold hiding places have sheltered a flourishing sea of little fishes for ages. But in four short decades, they are gone forever. Or are they? <\/p>\n\n\n\n

Today, not a stone\u2019s throw from the resort\u2019s dock, a staghorn thicket spreads across 4,000 square feet (372 square meters) of previously bare sand. This oasis of hope, which scientists and volunteers patched together piece by piece in 2013 using branches cultivated in a nearby underwater nursery of PVC trees, triumphantly spawned en masse in 2018. <\/p>\n\n\n\n

Having been present at the initial planting by volunteer divers from Reef Renewal Foundation Bonaire, Anna and I have taken the site\u2019s evolution to heart. As on previous visits, we conduct a Reef Environmental Education Foundation (REEF) fish survey on the revered patch. This year\u2019s fish count ballooned to 32 species, and there was a notable increase in biomass inhabiting the dense thicket.\u00a0Better yet, this restoration effort is far from the only one. With the combined force of the island\u2019s dive operations, citizenry, legions of visitors, the National Parks Foundation of Bonaire, and the Dutch government, 41,000 pieces of coral nurtured in 11 nurseries have been laboriously outplanted on areas blanketing more than 100,000 square feet (9.290 square meters) of fallow sea floor, all in a short decade. Hurray for all of us! <\/p>\n\n\n\n

<\/div>\n\n\n\n

\u00a9 Alert Diver<\/em> - Q1 2023<\/p>","protected":false},"excerpt":{"rendered":"

Pour le plus grand bonheur des plongeurs qui s\u00e9journent au Tawali Resort, sur les rives de Milne Bay, en Papouasie-Nouvelle-Guin\u00e9e, l'intuition d'Anna s'est r\u00e9v\u00e9l\u00e9e juste.<\/p>","protected":false},"featured_media":24150,"template":"","dan_alert_diver_categories":[68],"dan_alert_diver_issues":[484],"class_list":["post-24148","dan_alert_diver","type-dan_alert_diver","status-publish","has-post-thumbnail","hentry","dan_alert_diver_categories-encounters","dan_alert_diver_issues-q1-2023"],"acf":[],"yoast_head":"\nSpawning Seas Forever - DAN World<\/title>\n<meta name=\"description\" content=\"To the delight of the divers staying at Tawali Resort on the shores of Milne Bay in Papua New Guinea, Anna\u2019s hunch turns out to be right on track.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/world.dan.org\/fr\/alert-diver\/article\/spawning-seas-forever\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Spawning Seas Forever\" \/>\n<meta property=\"og:description\" content=\"To the delight of the divers staying at Tawali Resort on the shores of Milne Bay in Papua New Guinea, Anna\u2019s hunch turns out to be right on track.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/world.dan.org\/fr\/alert-diver\/article\/spawning-seas-forever\/\" \/>\n<meta property=\"og:site_name\" content=\"DAN World\" \/>\n<meta property=\"article:modified_time\" content=\"2023-05-31T16:46:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/world.dan.org\/wp-content\/uploads\/2023\/04\/q1_54_encounters-blur.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:description\" content=\"To the delight of the divers staying at Tawali Resort on the shores of Milne Bay in Papua New Guinea, Anna\u2019s hunch turns out to be right on track.\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/alert-diver\\\/article\\\/spawning-seas-forever\\\/\",\"url\":\"https:\\\/\\\/world.dan.org\\\/alert-diver\\\/article\\\/spawning-seas-forever\\\/\",\"name\":\"Spawning Seas Forever - 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